For some reason, after saving my map and then loading it up again, the default scene light no longer illuminates the terrain. It’s completely flat shaded: https://i.imgur.com/O4BT3td.png
I didn’t change anything at all from when it was working. The scene itself is very simple, I used the blank game blueprint, imported my terrain heightmap, created a material with a grey base colour, and that was it. Saved, closed UE4, loaded it up after a while, and now the light does not affect the terrain at all.
Any idea why that is?